I have not found examples of this in documentation or hackage packages: how can I deal with funcions returning not pointers to structs but structs thenselves?
struct example {...
example function_name (...
(...)
(...)
If it were my problem, I would try a wrapper function that returns the same value as an argument - e.g., if you have struct X f(), then
void f_(struct X *x) { *x = f(); }
(...) Ironically, that's actually just what the original function is doing - cf. "struct return convention", where the caller allocates space and passes a pointer as a hidden parameter. (...)
Can I be sure things always goes like that? I remember reading somewhere that if, for instance, a struct is smaller in size than a pointer (like a struct made of three chars), the struct could be returned by itself. Also, why Haskell FFI do not automate that? As long as it is Storable data, can't it get the pointer and 'peek' it for me? Thanks, Maurício